How to change the properties of the generated @font-face, like unicode-range or size-adjust?

[cangSDARM]

I need to blend chs and ens fonts, but some of the fonts we’ve chosen have an undesirable feature—such as excessive blank spacing—which results in unexpected CSS height/width values. Therefore, we have to adjust those properties to fit our applications.

Unfonts({
  custom: {
    families: {
      SourceHanSans: {
        name: 'SourceHanSans',
        local: 'SourceHanSans',
        src: './assets/fonts/SourceHanSansSC*',
      },
      Plangothic: {
        name: 'Plangothic',
        local: 'Plangothic',
        src: './assets/fonts/PlangothicP1*',
      },
    },
    preload: true,
    prefetch: true,
  },
}),

transform: font => {
  font.descentOverride = '95%'; //dont work

  return font;
}